George a



(No Model.)

G. A. LAMBERT.

PLOW COLTBR.

N0. 483,457. Patented Sep1; W489i? UNITED STATES PATENT OFFICE.

GEORGE A. LAMBERT, OE ORRINGTON, MAINE, ASSIGNOR OF ONE-HALF TO ARTHURA. YOUNG, OF SAME PLAGE.

PLOW-COLTER.

SPECIFICATION forming part of Letters Patent No. 483,457, datedSeptember 27, 1892.

Application filed October 30, 1891. Serial No. 410,317. (No model.)

.To aZ whom t may concern.'

Be it known that I, GEORGE A. LAMBERT, a citizen of the United States,residing at Orrington, in the county of Penobscot and State of Maine,have invented certain new and useful Improvements in Plow-Colters; and Ido hereby declare the following to be a f ull, clear, and exactdescription of the invention, such as will enable others skilled in theart to which xo it appertains to make and use the same.

The object of my invention is to produce an improved ploW-colter, whichis designed and adapted to aid the progress of a plow through a furrowand prevent the accumulation in front of the plow of rubbish, vines,

roots, or the like that tend materially to increase the labor ofdirecting the plow and the draft or weight of the load upon the teamwhich draws it. y

In the accompanying drawings, Figure 1 is a perspective view of a plowwith my colter attached as in use. Fig. 2 is a perspective wiew of thecolter detached.

Referring to the letters on the drawings, B indicates the shank of thecolter, which is preferably straight and somewhat flattened in itsvertical part, as indicated by the letter a, and is bent almost at rightangles at its lower end b.

A indicates the cutter-blade of the colter, that is composed of theparts cj, and g and is united to the shank and is preferably cast orforged with it. The cutter-blade terminates in a point, and its portionc is downwardly and 3 5 forwardly inclined, so as to present itscutting-edge d underneath opposing obstacles, thus severing them by ashearing action of the blade or forcing them upwardly out of the groundand not against the resistance of the 4o ground. The part f ot the bladeis laterally, rearwardly, and preferably somewhat downwardly bent. Thecutting-edge d of the part c of the blade is dished or concave andmerges gradually into the cutting-edge c of the part f, which isslightly convex. The two curves unite to form a regular smooth compoundcurve. At the part g the bladeAis twisted so as to form a spiral, andextending toward the rear of the shank exposes near its end a tlat broadside, into which the cuttingedge c in 5o eitect disappears.

The operation of my device is as follows: The colter being in positionupon a plow, as illustrated, for example, in Fig. 1 of the drawings, itspoint as the plow is driven into the soil cuts the ground in advance ofthe plow, and sinking beneath the surface cuts the obstructions thatoppose themselves with suiiicient resistance. Theloose rubbish itcarries along the compound curve of its blade, cut- 6c ting its way asoccasion may require, and finally deliecting and depositing from thetwisted arm gto one side of the plow any por tion of trash that mayremain uncut. In this manner a clean straight furrow maybe made. Theclogging of the plowis prevented and the load upon the team which drawsthe plow is materially diminished.

A-plowcolter consisting of a shank portion 7o attached to the rear ofthe ciittingblade, said blade having a downwardly and forwardlyprojecting cutting-point and being deflected laterally and rearwardlyabove its connection with the shank, its extreme rear portion beingtwisted to form a spiral and extending toward the rear of the shank in asubstantially-horizontal direction and havinga sharp front edge,substantially as and for the purpose specified.

GEORGE A. LAMBERT.

In presence of,-

ARTHUR A. YOUNG, G. M. MoALIsTER.

